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Colour-coded Weather Alerts

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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 08 December 2025

Today Tonight and Tuesday.

Wind variable 10 knots becoming northwest 10 near noon then increasing to southwest 15 early this evening. Wind increasing to southwest 25 near midnight then backing to south 30 early Tuesday morning. Wind veering to west 25 Tuesday afternoon.

Scattered flurries beginning near noon changing to snow Tuesday morning then to scattered flurries Tuesday evening. Visibility 1 mile or less in snow.

Waves

Issued 10:30 AM EST 08 December 2025
Today Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 this evening and to 1.5 late overnight. Waves building to 2 to 3 Tuesday morning then subsiding to 1.5 Tuesday evening.

Extended Forecast

Issued 03:00 AM EST 08 December 2025
Wednesday Wind light increasing to northeast 20 knots in the morning.
Thursday Wind northwest 20 knots.
Friday Wind light increasing to southwest 25 knots late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
Legend:
buoy Buoy
land station Land Station
Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EST 8 December 2025 Tonight and Tuesday At 6:30 p.m. EST tonight ridge located on a line northeast-southwest
over southern Ontario.
By 6:30 p.m. EST Tuesday ridge located east of the Eastern Seaboard.

At 6:30 p.m. EST tonight low 1010 mb located over North Dakota.
By 6:30 p.m. EST Tuesday low 1001 mb located over northeastern
Ontario.

By 6:30 p.m. EST Tuesday approaching low 990 mb located over
Minnesota.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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